I don't understand what the fuss is all about. They've agreed to play a few old songs live for a day, that's it. No mention of recording new materials from anyone, yet. Nor do I see them recording together anytime soon. For one thing, Waters is not going to record anything for the sake of Pink Floyd at this stage of his life. I also don't see Gilmour being content with just playing guitar on an album like Clapton and Beck.
As much as I like to believe that Bob Geldof brought all this together, I'd think that the recent death of Floyd manager Steve O'Rourke made this re-union a lot easier, for Waters had unresolved issues, business and personal, with O'Rourke.
And yes, Wright never gets much credit for his work, i.e, when he did or was allowed to put in some work. Ever wondered how pink those early Floyd albums (befor Animals) would have been without Wright, or what he might have added to Amused to Death?